Decluttering my space

Shalom dear 26 year old, and thank you for your question!
First and foremost, you write that it sounds stupid. Actually it doesn’t, because the smartest thing a person can do, is acknowledge that there is something that needs to be worked on.
You write that you cannot throw away certain types of garbage without crying, sweating and obsessing about it.
Here is a red light… Crying, sweating and obssessing, are not standard reactions to throwing out garbage or even old collections. At least not for most people.
You write that you are 26 years old, and still living with your parents. Although there’s nothing wrong with that, it is unusual. Are you working or studying? Are you happy with what you are doing? Are you clear on what you want to do in your life, what your goals are?
If you do throw items out, you feel that you are throwing out part of yourself… Are you happy with who you are? Does your identity depend on other factors outside of you and your free choice?
I am throwing out these questions to try to help you hear yourself. It all seems to add up to a strong need to review where you stand and how you can be helped.
You refer to ‘something spiritual to scare you…’ well, I’m not going to do that, because a person like you who is knocking on the door and searching for a way out doesn’t deserve to be scared, rather to be commended. However, it might be helpful to consider a serious case in Jewish law. Generally, abortion is forbidden, but if continuing a pregnancy is endangering the mother, the doctors are allowed to terminate the pregnancy. Why? In that unfortunate case, the embryo is considered to be like a pursuer, who may be killed because he is coming to kill you, and you must protect yourself. When I find it difficult to part with some item that objectively speaking is not a necessary one, but nevertheless I’m finding it difficult, I remind myself that it is like a pursuer, because ultimately it is going to cause me discomfort, annoyance, or it will encumber me in some way. There is a place for sentimentality, but when we constantly look backwards, we can trip up!
You mention difficulty in making decisions, this could be related to obsessiveness, don’t be quick to accuse yourself of ego. We all have to deal with our egos, but they are also necessary for survival, in healthy proportion.
It would be a good idea to learn ‘Shaar haBitachon,’ which is a section on trust in G-d in the classic Jewish ethical work called ‘Chovot haLevavot’, or ‘Duties of the Heart’. Increasing your trust in G-d will be a key factor in helping yourself go forward, because when you realize that G-d has your best interests in mind, and can truly do everything, and really wants good for you, it makes you happier, which already helps people let go of some emotional baggage, and helps you trust that life can and will improve, with G-d’s help!
To sum up, our recommendation is to get professional help, most preferably from someone with a Torah outlook, and G-d willing you will be able to get your life together! Additionally, it is important to have a spiritual mentor or coach. This should not be instead of the professional help mentioned above, but it should be someone living a religious lifestyle, whom you respect, and who can help you clarify spiritual goals that are doable, so that you can progress from one goal to another.
Wishing you much success in clarifying your goals, obtaining the help you need, and making progress slowly but surely towards living the balanced and healthy life that you have the potential to live!